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首页> 外文期刊>Materials Science and Engineering >A dilatometric study on the influence of compressive stresses on the tempering of martensitic AISI 4140 steel - Evidence of transformation induced plasticity during cementite precipitation
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A dilatometric study on the influence of compressive stresses on the tempering of martensitic AISI 4140 steel - Evidence of transformation induced plasticity during cementite precipitation

机译:压缩应力对马氏体AISI 4140钢回火影响的膨胀学研究-渗碳体析出相变诱发塑性的证据

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摘要

Modern surface hardening processes intend among other to induce compressive residual stresses in the near-surface layers of the part. During subsequent tempering, these stresses can affect the phase transformations. Dilatometric tempering experiments starting from martensitic AISI 4140 were performed with a uniaxial compressive stress that simulates the compressive residual stresses mentioned above. An unexpected strain drop, increasing with the applied stress, was measured. It is argued that this effect is due to transformation induced plasticity caused by the Greenwood-Johnson effect. For an applied compressive stress of 358 MPa, a strain decrease of 0.6% occurs which means that this has imperatively to be taken into account when tempering a hardened surface with compressive residual stresses.
机译:现代表面硬化工艺尤其旨在在零件的近表面层中引起压缩残余应力。在随后的回火过程中,这些应力会影响相变。从马氏体AISI 4140开始的膨胀回火实验是通过单轴压缩应力进行的,该模拟模拟了上述压缩残余应力。测量到意外应变下降,该应变下降随施加的应力而增加。有人认为,这种效应是由于格林伍德-约翰逊效应引起的相变诱导可塑性。对于358 MPa的压缩应力,应变降低了0.6%,这意味着在用压缩残余应力对硬化的表面进行回火时必须考虑到这一点。

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